add await on _load_discovered_nodes

Author: dirixmjm

plugwise_usb/network/__init__.py

@@ -488,7 +488,7 @@ async def _load_node(self, mac: str) -> bool:
     async def _load_stragglers(self) -> None:
         """Retry failed load operation."""
         await sleep(NODE_RETRY_LOAD_INTERVAL)
-        while not self._load_discovered_nodes():
+        while not await self._load_discovered_nodes():
             await sleep(NODE_RETRY_LOAD_INTERVAL)
 
     async def _load_discovered_nodes(self) -> bool: